Crank Angle Sensor

Crank angle sensor is located inside distributor on SOHC engines. Sensor is attached to cylinder head on DOHC engines. If malfunction occurs, Code 22 will set.

1. Install Test Harness (MB991348 ) between sensor and connector. On all models, using engine analyzer with oscilloscope capability, connect special patterns probe to specified connector terminal. See CKP PATTERN PICKUP TERMINAL ID  table.
   CKP PATTERN PICKUP TERMINAL ID
   
   

   Application	Terminal No.
   Eclipse 2.0L	2
   All Other Models	3

2. Start engine. Compare oscilloscope wave pattern with known-good wave pattern. See Fig 1 . Verify that wave length (time) decreases as engine RPM increases. If a wave pattern is output and it fluctuates to left or right, check for loose timing belt or an abnormality in sensor pickup disc. If a rectangular wave pattern is output even when engine is not started, substitute known-good CKP sensor. Repeat test. If wave pattern is still abnormal, go to step 5.
   Fig 1: Known-Good CKP Sensor Wave Pattern ID

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA
3. Connect an engine tachometer. Crank engine. Ensure ignition coil primary current toggles on and off. Using tachometer and scan tester, compare cranking speed and scan tester read out. If engine fails to start and tachometer reads zero RPM when engine is cranked, check for broken timing belt or faulty CKP sensor. If CKP sensor is suspected, substitute known-good CKP sensor. Repeat test procedure. If engine fails to start, tachometer reads zero RPM, and ignition coil primary current fails to toggle on and off, check for faulty ignition coil, ignition circuit or power transistor. If engine starts and readouts agree, go to next step.
4. Ensure A/C switch is in ON position to activate closed throttle position switch. Allow engine to idle. Check coolant temperature. Using scan tester, read idle speed. See IDLE RPM SPECIFICATIONS  table. If RPM is not to specification, check for faulty coolant temperature sensor, basic idle speed adjustment, or idle air control motor. If RPM is within specifications, go to next step.
   IDLE RPM SPECIFICATIONS
   
   

   Coolant Temperature			Engine RPM
   -4°F (-20°C)
   Eclipse			1500-1700
   Galant			1275-1475
   32°F (0°C)
   Eclipse			1350-1550
   Galant			1220-1420
   68°F (20°C)
   Galant			1100-1300
   Eclipse
   1.8L			1150-1350
   2.0L			1180-1380
   104°F (40°C)
   Eclipse, Galant			950-1150
   Eclipse
   1.8L			950-1150
   2.0L			1000-1200
   176°F (80°C)
   Galant			600-800
   Eclipse 2.0L			650-850

   Fig 2: Ignition Switch Terminal ID

   Courtesy of MITSUBISHI MOTOR SALES OF AMERICA
5. On all models, disconnect CKP/CMP sensor connector. Turn ignition switch to ON position. Using DVOM, check voltage between chassis ground and specified CKP/CMP sensor connector terminal. See CKP SENSOR VOLTAGE TERMINAL ID  table. If battery voltage does not exist, repair ignition circuit between CKP/CMP sensor connector and Ignition switch. If battery voltage exists, go to next step.
   CKP SENSOR VOLTAGE TERMINAL ID
   
   

   Application	Terminal No.
   Eclipse 1.8L	2
   All Other Models	3

6. With CKP/CMP sensor connector disconnected, check for continuity between chassis ground and specified CKP/CMP sensor connector terminal. See CKP SENSOR GROUND CIRCUIT TERMINAL ID  table. If continuity does not exist, repair wiring harness as necessary. If continuity exists, go to next step.
   CKP SENSOR GROUND CIRCUIT TERMINAL ID
   
   

   Application	Terminal No.
   Eclipse 2.0L	4
   Galant	2
   All Other Models	1

7. On Eclipse, go to next step. On Galant, with CKP/CMP sensor connector and ECM connector disconnected, check for continuity between specified CKP/CMP sensor connector terminal and ECM connector terminal. See CKP TO ECM CONNECTOR TERMINAL ID  table. If continuity does not exist, repair wiring harness as necessary. If continuity exists, go to next step.
   CKP TO ECM CONNECTOR TERMINAL ID
   
   

   Application	CKP Terminal No.	ECM Terminal No.
   All Models	3	69

8. With ignition switch in ON position, check for voltage between chassis ground and specified CKP/CMP sensor connector terminal. See CKP SENSOR SUPPLY CIRCUIT ID  table. If 4.8-5.2 volts do not exist, replace ECM. If voltage is to specification and CKP sensor is suspected, replace CKP sensor.
   CKP SENSOR SUPPLY CIRCUIT ID
   
   

   Application	Terminal No.
   Eclipse 2.0L	2
   Galant	1
   All Other Models	3